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//例子 :
/**
* 操作符重載*/
#include <iostream>
using namespace std;
class RMB{
private:
unsigned int yuan; //元
unsigned int jf; //角分
public:
RMB(double d){
yuan = static_cast<unsigned int> (d);
jf = static_cast<unsigned int> ((d-yuan)/100);
}
RMB interest(double rate);//計算利息
RMB add(RMB d);
void display(){
cout << (yuan + jf/100.0)<< endl;
}
RMB operator+ (RMB d){//人民幣+運算符重載
return RMB(yuan + d.yuan + (jf + d.jf)/100);
}
RMB operator* (double rate){
return RMB( (yuan+jf/100) * rate);
}
};
RMB RMB::interest(double rate) {
return RMB((yuan + jf/100.0) * rate);
}
RMB RMB::add(RMB d){
return RMB(yuan + d.yuan + jf/100.0+ d.jf/100.0);
}
RMB expense1(RMB principle , double rate){
RMB interest= principle.interest(rate);
return principle.add(interest);
}
RMB expense2(RMB principle , double rate){
RMB interest = principle * rate;
return principle + interest;
}
int main(){
RMB x =10000.0;
double yrate=0.035;
expense1(x,yrate).display();
expense2(x,yrate).display();
return 1;
}
//以上代碼在gcc mingw windows環境中編譯通過
操作符重載注意事項 :
1 "." , "::" , ".*" , ".->" , "?:" 這5個操作符在c++標準中是不允許重載的,也不可以創造新的操作符
2 操作符在重載后運算優先級保持不變
3 重程序易讀性上考慮,操作符重載盡量不要悖棄操作符的本意
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